Check the oil level.
Most Dixies I see here have an oil sensor.
When the oil is low, and the engine is cold, there is enough oil in the sump not to trigger the switch.
When it is running, the low oil level drops just low enough to trip the low out switch because of all of the oil that is tossed around in the engine.
On a slop this is worse if the switch is on the uphill side of the crank case.
After 1/2 hour or so , all the oil has drained back into the sump so it is good to go.
Second thing ( might be both ) is the tank not venting or the outlet plugged with floating debris
Last one is the charging system not keeping up with the load from the clutch.